Furnace



Jan. 30, 1923. 1,443,776.

R. J. WILSON.

FURNACE.

FILED AUG. 30.1921.

ATTORNEY Patented Jan. 30, 1923.

UNITED STATES FATE OFFICE.

ROBERT J. WILSON, OF SEATTLE-WASHINGTON.

FURNACE.

Application filed August 30, 1921. Serial No. 496,826.

- parts hereinafter described and claimed.

In the accompanying drawings,

Figure 1 is a longitudinal vertical section taken substantially through broken line 1-1 of Fig. 3. Fig. 2 is a sectional plan view through'broken line 2-2 of Fig. 1. Fig. 3 1s a transverse sectional view through line 3-3 of Fig. 2, parts to the right of line 33 being omitted. Fig. 4 is a detail sectional view of the rotary scraper shown detached, said section being taken on broken lined-4 of Fig. 2.

Referring to the drawings, the numeral 5 represents a circular plate having a central opening 6 and a plurality of slots 7 and constitutes the grate member of my burner.

Extending upwardly about the periphery of the grate 5- is a circular wall 8.

Below the grate and rigidly connected therewith is a casing 9 containing a cylindrical chamber 10 ofapproximately the internal diameter of the Wall 8.

The chamber floor 11 is provided with a central circular opening 12 of approximately the diameter of the grate opening 6 and is connected by an elbow passage 13 with a horizontal conduit 14 leading from the outlet 15 of a fuel hopper 16.

Provided within the conduit 14 is one or more helical conveyors 17, two being shown, whereby coal or other suitable fuel is transferred from the hopper 16 through conduit 14 and elbow passage 13, the curved end 13 of the latter serving to direct the fuel upwardly through the floor and grate openings 12 and 6 onto the grate 5. I

In being elevated to the grate, the fuel is guided by means of a ring 20 which constitutes the hollow hub of awheel or scraper which is adapted to rotate in the direction of arrow A in Fig. 2. Said wheel has arim 21 which is connected by spokes 22 with the hub 20.

Each of said spokes is in the nature of a scraper blade and has its leadingedge 23, as shown in Fig. 2, curved forwardl with reference to its direction of travel or the purpose of progressively scraping the floor of cinders 0r ashes and conveying the same through ways 19 provided beneath the hub to be elevated with the fuel feed onto the grate.

Carried by the scraper hub 20 is an attachment provided with a shank 26 which extends upwardly through the grate opening 6 and thence extends as a plow 27 over the grate in asubstantially radial direction with respect to the grate axis The underside of the plow 27 is plane and its upper surface 28 is curved, as shown,- whereby the plow in its orbital travel acts to progressively elevate the fire bed from the grate.

29 represents a motor driving a shaft 30 upon which" is mounted a worm 31 which serves to rotate a'worm wheel 32 mounted on a second shaft 33.

This second shaft, in turn, drives through the medium of a spur pinion 34 and a gear wheel 35, a third shaft 36 which latter has mounted thereon within the chamber. 10 a toothed pinion 37 engaging teeth 38 provided in the underside of the scraper mm 21 to effect the rotation of the scraper.

As illustrated in Figs. 1 and 2, the shaft 36 is utilized to drive the conveyors 17.

through the medium of gear wheels 36' and 17'. I

Air for combustion purposes is supplied into the chamber 10 by a duct 39 leading from the housing of a fan or blower 40 which is advantageously mounted on the motor driven shaft 30.

41 represents a gate provided in the outlet of the hopper'16 to regulate the delivery of fuel therefrom to the conveyor.

To obviate down-draft through'the openings 19, I provide an aperture 42 in the floor 11 to admit air from the chamber 10 into the conduit 14 at a short distance from the floor opening 12:.

The plow 28 abovethe grate 5 isrevolved effect the combustion of the fuel delivered by the feeding devices over such fire bed.

The plow 28 by its revoluble travel serves to spread the fuel upon the grate, break up the bed of fire and discharge the ashes over the top of the wall 8.

-Any ashes falling through the grate slots 7 are swept by the scraper blades 22 into the vertically moving column of fuel to be elevated thereby to above the fire bed on the grate. The air for combustion is supplied under a forced draft into the chamber 10 whence it escapes through the grate slots 7 to the fire.

Changes may be made in the details of the invention as herein embodied without departing from the spirit thereof and I accordingly do not confine the invention to the specific embodiments shown except as I may be limited by the appended claims.

lVhat I claim, is-

1. In apparatus of the class described, the combination of a grate having a central feed opening, means for forcing fuel from below through said grate opening, a plow revoluble above the grate, and means to drive the plow.

2. In apparatus of the class described, the combination with a circular grate having a central feed opening, a wall provided about the periphery of said grate, a plow located above the grate, power driven means extending through the grate opening for revolving said plow, and means for forcing fuel from below through said grate opening and cooperating with said plow to delivefil the ash products over the top of said Wa 3. In apparatus of the class described, the combination of a grate having a central feed opening, means for feeding fuel from below through said grateopening. a compressedair receiving chamber located below the grate, a plow revoluble upon said grate to loosen the fire-bed therefrom for the admission of air through the grate from said chamber.

4. In apparatus of the class described, the combination of a grate having a central feed opening and a plurality of apertures in the part of the grate surrounding said opening, a chamber below the grate, an under fuelfeed extending through said chamber, and revoluble means provided in said chamber whereby ashes falling through said grate apertures are conveyed into said fuel-feed.

In apparatus of the class described, the combination of a grate having a central feed opening, an elbow passage provided below said opening, power driven devices for feed ing fuel upwardly through said elbow passage and the grate opening. and power driven means whereby ashes falling through the grate are conveyed into the fuel-feed above said elbow passage.

6. In apparatus of the class described, the combination of a grate, an underfeed therefor, a chamber located below the grate, a rotatable scraper provided in said chamber, said scraper having curved blade elements adapted to convey to said underfeed ashes which fall through the grate, a revoluble plow provided on said grate and operatively connected to said scraper, and means for driving said scraper.

Signed at Seattle, Washington, this 23rd day of August, 1921.

ROBERT J. WILSON.

\Vitnesses Pnnnu: BARNES, MARGARET G. SUPPLE- 

